Fair Value Disclosures - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) numberOfSwaps	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) numberOfSwaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liability, payment	$ 635,000	$ 635,000
Servicing rights carrying amount before valuation allowance	5,700,000		$ 9,100,000
Servicing rights valuation allowance	18,000		98,000
Other real estate owned	19,200,000		19,000,000
Repossessed assets	167,000		0
Credit derivatives | Fair Value Measure on Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	120,000		186,000
Level 3 | Credit derivatives | Fair Value Measure on Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	$ 120,000		$ 186,000
Number of interest rate swaps held | numberOfSwaps	136		133
Notional Amount	$ 878,500,000		$ 862,800,000
Paul I. Scheaffer Insurance Agency
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liability discount rate	0.083		0.083
Contingent consideration liability, payment	$ 635,000		$ 653,000
Business combination, contingent consideration, liability, current	601,000		1,200,000
Potential cash payments, lower range	0		0
Potential cash payments, upper range	635,000		1,300,000
Held for Investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of individually analyzed loans and leases held for investment	19,700,000		20,700,000
Valuation allowance of individually analyzed loans and leases held for investment	2,000,000		1,800,000
Lease financings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of individually analyzed loans and leases held for investment	$ 0		$ 0